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Thread: New laser diode driver design.

  1. #21
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    Post deleted, to avoid time wasting.
    Last edited by The_Doctor; 04-20-2010 at 11:25.

  2. #22
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    Yea, I figured it was the modulation, best to ask tho .
    Time passed way to fast today. Got stuck in the soldering-lab harvesting old pcb's for useful stuff (maybe). Managed to get a rather neat bunch of 4Mhz op-amps and a couple of cd/cd converters.
    And, umm.. I dont know why I'm saving them, but hey... -lots of sn74ls450n and optocouplers as well.

  3. #23
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    always keep those discrete logic ICs...

    you never know when you'll have an argon PSU to repair (or build)

  4. #24
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    Quote Originally Posted by shrad View Post
    always keep those discrete logic ICs...

    you never know when you'll have an argon PSU to repair (or build)
    Well... i guess I have at least a year to find out My "school" has quite a bit of them to spare (logic ICs, not argons, unfortunately), like... umm... A closet full, not exaggerating.
    Something that annoys the heck out of me is that they wont let me loose on the SMD-machines and multilayer board-equipment they have standing in a back room together with a huge reflow oven...
    All that great stuff just standing there.. I havnt seen anyone use it since august...

    Back on topic: Would 4Mhz quad op-amps work...
    TS924IN...to make a "2-in-1 driverboard"? I've been looking everywhere for faster ones, but with no luck.
    -Might just make them buy me some 400Mhz norton amps.
    Last edited by Occularis; 03-31-2010 at 08:25.

  5. #25
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    Post deleted, to avoid time wasting.
    Last edited by The_Doctor; 04-20-2010 at 11:25.

  6. #26
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    Argh.. I'm in love:

    LM2727MTC Switching regulator 5Mhz .0,7-20A (~3us$)
    LM833N dual op-amp DIL8 15Mhz -Gotta get a bunch of those.. less than 1us$/unit.
    MAX4012EUK op-amp SOT23-5 200Mhz -Cheeeap! 23sek (roughly 3us$)
    AD8001AN op-amp DIL8 880Mhz (!) 87sek (~11us$)

    Now lets' see how much I can get the school to spend

  7. #27
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    Post deleted, to avoid time wasting.
    Last edited by The_Doctor; 04-20-2010 at 11:25.

  8. #28
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    Hmf.. My layout is all messy compared to yours... Gotta make another try
    -However mine is only 1,06 x 1,65"... Oh well, I gotta get back to my wallpaper *sigh*

  9. #29
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    Last edited by The_Doctor; 04-20-2010 at 11:26.

  10. #30
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    2,55x1,8"
    Double layer. (or rather 2 singlesided pcb's bonded together)
    Double circuit as well. Dual modulation inputs, and 4x 25-turn pots on board.

    Edit: Crap. I just realized my program decided to remove the Vin pins, lol.
    Oh well, you get the idea. 2 drivers on 1 board. 1 for red, one for blue or whatever, with separate modulation inputs, pots and regulators. I'll fix my little misstake with the voltage supply soon enough ^^

    Fixed it. Updated image.
    Amp used: LM833N
    "Low input noise
    voltage: 4.5nV/√Hz
    High slew rate: 7 V/μs (typ); 5V/μs (min)
    High gain bandwidth: 15MHz (typ); 10MHz (min)
    Wide power bandwidth: 120KHz
    Low distortion: 0.002%
    Low offset voltage: 0.3mV"
    Attached Thumbnails Attached Thumbnails Spice2..jpg  

    Last edited by Occularis; 04-02-2010 at 12:24. Reason: Fixed board...

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